[time-nuts] Symmetricom (Datum/Microsemi) CS tubes after storage

paul swed paulswedb at gmail.com
Wed Jun 20 19:52:41 EDT 2018


Julien
Do you see any reduction in the current. It may be slight. If so time is
your friend. Let it cook.
If not KE5FX is a time nut also. Here is what he did.
http://www.ke5fx.com/cs.htm
Granted you need a 3KV supply and it is hazardous. I am not an expert on
your tube.
Others may have better insights.
Good luck.
Regards
Paul.

On Wed, Jun 20, 2018 at 7:32 PM, Julien Goodwin <time-nuts at studio442.com.au>
wrote:

> I recently picked up a used Cs clock (Symmetricom labelled Cs4000).
>
> Sadly, it turns out to have been stored for about a year (at least, a
> year since it was last claimed to lock) and doesn't appear to be locking.
>
> I've had it on for about a month now, and ion pump current is still
> quite high[1].
>
> Given the unit is now over 10 years since manufacture, with power on
> hours of ~5 years I'm guessing this now probably has a dead tube, and
> unless I want to spring for a new tube I have a paperweight.
>
> 1: Monitor3 display for the unit including the alarm window:
> https://julien.studio442.com.au/images/cs4000_monitor3.png
> (That's the set that fires after alarms are cleared)
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